Patrick Carney of The Black Keys told The AP that his bandmates are very proud to take part in the concert.

"The scale of things that they're trying to do just felt really cool, and we're trying to get the ball rolling," Carney said.

"Especially with everything that's been going on for the last three years, I suppose, after the stock market crashed.

"There's attention on the amount of people living below the poverty line and the disparity between the rich and the poor and everything that's going on now... It just felt like the right time to do something."